Reticulofenestra haqii


Ancestry: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. pseudoumbilicus group -> Reticulofenestra haqii
Sister taxa: R. calicis, R. pseudoumbilicus, R. haqii, R. minuta, R. rotaria, R. minutula, R. asanoi,

Short diagnosis: Coccoliths small (3-5µm), intergrades with R. pseudoumbilicus.


Taxonomy:

Citation: Reticulofenestra haqii Backman, 1978
Rank: Species
Variants:

Farinacci & Howe catalog pages: Reticulofenestra haqii * Reticulofenestra lingfengensis *

Short diagnosis: Coccoliths small (3-5µm), intergrades with R. pseudoumbilicus.

Geological Range:
Last occurrence (top): within NN15 zone (3.70-3.92Ma, top in Zanclean stage). Data source: Young 1998
First occurrence (base): within NN2 zone (18.28-22.82Ma, base in Aquitanian stage). Data source: Young 1998

Plot of occurrence data:

References:

Backman, J., (1978). Late Miocene - Early Pliocene nannofossil biochronology and biogeography in the Vera Basin, SE Spain. Stockholm Contributions in Geology, 32: 93-114.

Wang, C. & Huang, W., (1989). Calcareous nannofossils Cenozoic Paleobiota of the Continental Shelf of the East China Sea (Donghai). Micropaleobotanical Vol. Geol. Pub. House, Beijing, pp. 202-252.

Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.


Nannotax3 - Coccolithophores - Reticulofenestra haqii by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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Ines Galovic (CGS, Croatia)
It is clear on the holotype figures of both R. haqii and R minutula species (dimension around 4 µm and almoust the same number of elements) that R. haqii has smaller opening (around 1 µm) than minutula (around 2 µm) . Your figures of birefringence and last SEM here mostly are not presented by typical figures of haqii origin. Could you please give us (Paratethian workers who are not dealing with younger sediments) more information why you put this species in hagii?
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Jeremy Young (UCL, UK)
Reticulofenestra taxonomy is, of course, problematic and difficult to standardise. My approach in the Neogene is to use coccolith size and shape but not central area opening size. Hence for me all the illustrated forms fall in R. haqii.
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